Case-Mate, Inc. iPhone 4/4S Creature Butterflies Case - Turquoise - Retail Packaging - Teal Take charge with built in power: Up to 10 hours of continuous play time with the 1200mAh battery. You can also plug your mobile device's charging cable into the speakers USB port and get an extra boost of power when you're away from home. Get Connected: Bluetooth 3.1, 33 ft. operating distance, 3.5mm line-in, 3.5mm out jack to connect to other Braven Speakers. Rich High Fidelity Audio: 2X custom extended range drivers. Left and Rich channel passive sub woofers. 6W Speaker output ( 3W per channel)